Does anyone know where I might be able to find some basic quilted calico (or other cotton) to use for bag linings?
I’ve found expensive patterned quilted cotton (very pretty, but not what I need) and basic calico with just 2 layers (the calico top and polyester batting) but no 3 layer stuff - everything available seems to be polyester heavy and / or have a nylon backing - yuk!
If not may be easier to quilt your own as calico washed is very cheap. I normally quilt my own cottons.
Thanks very much Caroline, Google didn’t show me that one! 
Yes, I did think about quilting my own but was also thinking that it’d be too time consuming to make it profitable (would take longer than adding iron on wadding to the outer, which is my alternative). Perhaps I’ll have a go and see how long it takes…